Tibellus is a genus of slender crab spiders described by Simon in 1875, belonging to the order Araneae, family Philodromidae. Species of this genus are present in Eurasia, Africa, Americas and Australia.
Spiders are air-breathing arthropods that have eight legs and chelicerae with fangs able to inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exceptions of air and sea colonization. As of November 2015, at least 45,700 spider species, and 113 families have been recorded by taxonomists. However, there has been dissension within the scientific community as to how all these families should be classified, as evidenced by the over 20 different classifications that have been proposed since 1900.
Philodromidae is a family of spiders commonly known as philodromid crab spiders or running crab spiders. This family is superficially similar to the "true" crab spiders in the family Thomisidae.
Eurasia is the combined continental landmass of Europe and Asia. The term is a portmanteau of its constituent continents. Located primarily in the Northern and Eastern Hemispheres, it is bordered by the Atlantic Ocean to the west, the Pacific Ocean to the east, the Arctic Ocean to the north, and by Africa, the Mediterranean Sea, and the Indian Ocean to the south. The division between Europe and Asia as two different continents is a historical social construct, with no clear physical separation between them; thus, in some parts of the world, Eurasia is recognized as the largest of the six, five, or even four continents on Earth. In geology, Eurasia is often considered as a single rigid megablock. However, the rigidity of Eurasia is debated based on paleomagnetic data.
Adult members of this genus can reach 4–15 millimetres (0.16–0.59 in) of length and can mostly be encountered above the soil surface (epigeal organism) on low vegetation, foliage or herbaceous plants, where they actively pursue their preys, as they do not make webs. This genus, which includes active hunters, was once considered a subfamily within the sedentary 'crab spiders' (Thomisidae species).
Epigeal, epigean, epigeic and epigeous are biological terms describing an organism's activity above the soil surface.
The Thomisidae are a family of spiders, including about 175 genera and over 2,100 species. The common name crab spider is often linked to species in this family, but is also applied loosely to many other species of spiders. Among the Thomisidae, "crab spider" refers most often to the familiar species of "flower crab spiders", though not all members of the family are limited to ambush hunting in flowers.
The basic color of the body is light brown or pale yellow. It is elongate and slender (hence the common name), the carapace (prosoma) and the cylindrical abdomen (opisthosoma) show a large brown stripe in the midline of the back. The long and thin legs are more or less equal in length and they usually are stretched out along grass stems or leaves, the first two pairs forwardly directed.
The opisthosoma is the posterior part of the body in some arthropods, behind the prosoma (cephalothorax). It is a distinctive feature of the subphylum Chelicerata. Although it is similar in most respects to an abdomen, the opisthosoma is differentiated by its inclusion of the respiratory organs and the heart.
They generally have eight black equal-sized eyes in two horizontal rows of four each, with posterior median ones close to each other.
Tibellus chamberlini is a species of running crab spider in the family Philodromidae. It is found in the United States and Canada.
Tibellus duttoni is a species of running crab spider in the family Philodromidae. It is found in the United States and Mexico.
Tibellus macellus is a spider found from Europe to Central Asia.
Thanatus is a genus of 'false crab spiders' described by Carl Ludwig Koch in 1837, belonging to the Order Araneae, Family Philodromidae.
Pellenes is a spider genus of the Salticidae family.
Rhene is a spider genus of the Salticidae family.
Runcinia is a genus of crab spiders with about 30 described species.
Tmarus is a genus of crab spiders, comprising the following species:
Pardosa is a large genus of wolf spiders, with more than 500 described species that are found in all regions of the world.
Callilepis is a genus of gnaphosid spiders with about 20 described species. Some are found from Mexico to Canada, others from Europe to India. They are most commonly found in dry areas, sandy roads and beaches.
Thomisus is a genus of crab spiders with almost 150 species described. The genus includes species that vary widely in their ecology, but the best known crab spiders are those species that people call the flower crab spiders, because they are ambush predators that feed on insects visiting flowers. The flower crab spiders are the species for which the popular name was coined, because of their crab-like motion and their way of holding their front legs in an attitude reminiscent of a crab spreading its claws as a threat.
Gnaphosa is a ground spider genus.
Oxyopes is a genus of lynx spiders found worldwide. It includes arounds 300 species and is classified under the lynx spider family Oxyopidae. Like other lynx spiders, they are easily recognizable by the six larger eyes arranged hexagonally on top of the head (prosoma), with the remaining smaller two eyes in front. They are also characterized by long spine-like bristles (setae) on their legs. They are ambush predators, actively hunting prey by sight. Though they produce and use silk, they do not build webs to capture prey.
Scotophaeus is a genus of spiders in the family Gnaphosidae.
Hippasa is a genus of wolf spiders in the family Lycosidae, containing thirty five accepted species.
Monaeses is a genus of crab spiders in the family Thomisidae, containing twenty seven species.
Heriaeus is a genus of spiders in the Thomisidae family. It was first described in 1875 by Simon. As of 2017, it contains 35 species.
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